<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格 -->
      <tree-table class="treeTable" :data="cateList" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="#" border>
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted === false"></i>
          <i class="el-icon-error" v-else></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="mini" v-else-if="scope.row.cat_level === 1" type="success">二级</el-tag>
          <el-tag size="mini" v-else type="warning">三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button @click="showEditDialog(scope.row.cat_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
          <el-button @click="removeCateById(scope.row.cat_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>

      <!-- 分页区 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog @close="addCateDialogClosed" title="添加分类" :visible.sync="addCateDialogVisible" width="50%">
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <!-- options指定数据源 -->
          <el-cascader change-on-select clearable v-model="selectedKeys" :options="parentCateList" :props="cascaderProps" @change="parentCateChange"></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑商品分类对话框 -->
    <el-dialog @close="editCateDialogClose" title="修改商品分类名称" :visible.sync="editCateDialogVisible" width="50%">
      <el-form :model="editCateForm" :rules="editCateFormRules" ref="editCateFormRef" label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类数据列表
      cateList: [],
      //   总数据条数
      total: 0,
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //为table指定列的定义
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name',
        },
        {
          label: '是否有效',
          // 将当前列定义为模板列
          type: 'template',
          template: 'isok',
        },
        {
          label: '排序',
          // 将当前列定义为模板列
          type: 'template',
          template: 'order',
        },
        {
          label: '操作',
          // 将当前列定义为模板列
          type: 'template',
          template: 'opt',
        },
      ],
      // 控制添加分类对话框的显示与隐藏
      addCateDialogVisible: false,
      // 添加分类表单中的数据对象
      addCateForm: {
        cat_name: '',
        // 分类父 ID
        cat_pid: 0,
        // 分类层级
        cat_level: 0,
      },
      // 添加分类表单验证规则
      addCateFormRules: {
        cat_name: [{ required: true, message: '请输入分类名称', trigger: 'blur' }],
      },
      // 父级分类列表
      parentCateList: [],
      // 级联选择器的配置对象
      cascaderProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      // 选中的父级id的数组
      selectedKeys: [],
      // 控制编辑分类对话框的显示与隐藏
      editCateDialogVisible: false,
      // 编辑分类对话框的数据对象
      editCateForm: {},
      // 编辑分类表单验证规则
      editCateFormRules: {
        cat_name: [{ required: true, message: '请输入分类名称', trigger: 'blur' }],
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取分类商品数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo,
      })
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      //console.log(res)
      this.cateList = res.data.result
      //   console.log(res.data)
      //console.log(res.data)
      //console.log(res.data.length)
      this.total = res.data.total
    },
    // 监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    // 添加分类点击处理函数
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 },
      })
      if (res.meta.status !== 200) return this.$message.error('获取父级分类数据失败')
      // console.log(res.data)
      this.parentCateList = res.data
    },
    // 选择项变化就出发这个函数
    parentCateChange() {
      if (this.selectedKeys.length > 0) {
        // 父级分类id
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        // 等级
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        this.addCateForm.cat_pid = 0
        // 等级
        this.addCateForm.cat_level = 0
      }
      // console.log(this.selectedKeys)
    },
    // 点击确定触发
    addCate() {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) return this.$message.error('添加分类失败')
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 监听添加对话框关闭
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_pid = 0
      // 等级
      this.addCateForm.cat_level = 0
    },
    // 删除操作
    async removeCateById(id) {
      // console.log(id)
      // 弹框提示
      const confirmRes = await this.$confirm('此操作将永久删除该商品分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
      }).catch((err) => err)
      if (confirmRes !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) return this.$message.error('删除用户信息失败')
      this.$message.success('删除用户信息成功')
      this.getCateList()
    },
    // 编辑操作
    async showEditDialog(id) {
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) return this.$message.error('获取分类失败')
      this.$message.success('获取分类成功')
      this.editCateForm = res.data
      this.editCateDialogVisible = true
    },
    // 编辑商品分类对话框确定按钮
    editCate() {
      this.$refs.editCateFormRef.validate(async (valid) => {
        const { data: res } = await this.$http.put('categories/' + this.editCateForm.cat_id, { cat_name: this.editCateForm.cat_name })
        if (res.meta.status !== 200) return this.$message.error('更新分类名称失败')
        this.$message.success('更新分类名称成功')
        this.getCateList()
        this.editCateDialogVisible = false
      })
    },
    // 修改商品分类对话框的事件监听
    editCateDialogClose() {
      this.$refs.editCateFormRef.resetFields()
    },
  },
}
</script>

<style lang="less" scoped>
.el-icon-success {
  color: lightgreen;
}
.el-icon-error {
  color: red;
}
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>